Unfortunately it’s to do with the way WordPress works, the import/export brings over the posts/page/images content, but certain dynamic things like widgets and menu settings need to be done manually.
If you go to appearance>widgets you’ll see a sidebar on the right for the footer. Drag over the relevant widgets you wish to display in the footer sidebar and save to repopulate the footer.
In appearance>widgets, you’ll see a sidebar for the standard left/right area. Inside you’ll see a widget with the shortcode inside, remove this by dragging it out back into the unused widgets area.